Tests fail on v0.5

[ranjanan]

On rc1, testing the latest ASTInterpreter, I get the following error:

ERROR: LoadError: UndefVarError: getnode not defined
 in include_from_node1(::String) at ./loading.jl:426
 in macro expansion; at ./none:2 [inlined]
 in anonymous at ./<missing>:?
 in eval(::Module, ::Any) at ./boot.jl:234
 in process_options(::Base.JLOptions) at ./client.jl:239
 in _start() at ./client.jl:318
while loading /Users/ranjan/.julia/v0.5/ASTInterpreter/src/ASTInterpreter.jl, in expression starting on line 101
ERROR: LoadError: Failed to precompile ASTInterpreter to /Users/ranjan/.julia/lib/v0.5/ASTInterpreter.ji
 in compilecache(::String) at ./loading.jl:505
 in recompile_stale(::Symbol, ::String) at ./loading.jl:581
 in _require_from_serialized(::Int64, ::Symbol, ::String, ::Bool) at ./loading.jl:173
 in _require_from_serialized(::Int64, ::Symbol, ::Bool) at ./loading.jl:202
 in require(::Symbol) at ./loading.jl:332
 in include_from_node1(::String) at ./loading.jl:426
 in process_options(::Base.JLOptions) at ./client.jl:262
 in _start() at ./client.jl:318
while loading /Users/ranjan/.julia/v0.5/ASTInterpreter/test/runtests.jl, in expression starting on line 1

[Keno]

update AbstractTrees